Robtex

Up: 138.204.240.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 138.204.240.0/25
Down right: 138.204.240.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
138.204.240.10	PTR	10-240-204-138.coltelecom.net.br
138.204.240.10	A	ns1.coltelecom.net.br
138.204.240.10	A	coltelecom.net.br
138.204.240.14	PTR	srv-14.coltelecom.net.br
138.204.240.14	A	ns2.coltelecom.net.br